Sulcus of spinal nerve
The transverse processes of the cervical vertebrae contain a hole known as the transverse foramen or foramen transversium. The transverse processes contain an anterior and a posterior part known as tubercles. These tubercles are connected together by a bar of bone lateral to the transverse foramen. This bar of bone is called the costal lamella or intertubercular lamella. On the superior surface of the costal lamella there is a deep surface to allow for the exit of the corresponding spinal nerve from the vertebra so they can send signals to the rest of the body. This is called the sulcus of the spinal nerve or the groove for spinal nerve.
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